. >>> number four, the pentagon has grounded the entire fleet of f-35 fighter jets because a crack in the engine of one of the planes was found during a routine inspection. now the f-35 program costs $400 billion. it's the most expensive weapons system in military history. >>> finally number five. police are searching for the people who were inside a range rover sport involved in a las vegas shooting. listen to this -- shots were fired from that car, killed the driver of a maserati. the maserati then crashed into a taxi. the taxi bust into flames. the taxi driver and his occupant were killed. this caused a major pileup on the las vegas strip. three other people were injured. >>> we've got an update now to a story we brought you as breaking news at the top of the hour. cambridge police on the campus of m.i.t. are now giving the all clear. earlier, they searched buildings on campus after there were reports of a person with a rifle who was also wearing body armor. well, their search turned up nothing. all clear at m.i. t. >>> let's go to politics now. just less than a week away really fr